JP2000308887A - Water purifying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance production efficiency of electrolyzed water in a water purifier for purifying and sterilizing water by using a filter means and an electrolytic means. SOLUTION: A downstream side of a filter tank 16 is connected to an electrolytic bath 17 through a bypass path 18, and salt water is fed from a salt water path 21 to the bypass path 18 to be electrolyzed. Thus, this device is constituted such that the electrolysis is performed while a circulation flow of water is generated and, while a chlorine ion concentration is made uniform, the electrolysis can be performed, and thus, the production efficiency of the electrolytic water is enhanced, and also the sterilizing performance can be enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to purification of water, and more particularly to filtration and sterilization of domestic wastewater such as bathtub water and industrial wastewater.

[0002]

2. Description of the Related Art A conventional water purification apparatus of this type is disclosed in
What was described in -225391 was common. This conventional example describes generation of electrolyzed water, particularly, hypochlorous acid and hypochlorite ions.
As shown in FIG. 9, a water purification tank 2 and an electrolysis tank 3 are provided integrally, and these are separated by a partition wall 4.
The water purification tank 2 is filled with a purification material 5 for propagating microorganisms having a purification action.

[0003] The water sent into the water purification device 1 is branched into a water purification tank 2 and an electrolysis tank 3 and passes therethrough. At the purification material 5 part, the organic matter in the water is decomposed by the action of microorganisms.
Hypochlorous acid or hypochlorite ions (hereinafter, these are collectively referred to as hypochlorous acid) are generated in the electrolysis tank 3 to sterilize bacteria in water. The branched water rejoins downstream of these and is discharged from the device. In this device, the flow rate of water passing between the electrodes 6 in the electrolysis tank 3 can be made slower than in the case where the electrolysis tank 3 is directly disposed in the flow path, so that the electrolysis is performed more efficiently. Therefore, the sterilization performance can be improved.

[0004]

However, the above-mentioned conventional water purification apparatus has the following problems.

(1) Since the flowing water is electrolyzed, the efficiency of hypochlorous acid generation is low, and sufficient sterilization performance may not be exhibited.

(2) Since the concentration of chloride ions in water is not constant, the concentration of generated hypochlorous acid varies, and sterilization performance is not stable.

(3) When the purifying material is clogged and the pressure loss of the purifying material rises, most of the water passes only through the electrolysis tank, so that sufficient purifying performance (for example,
Turbidity performance and organic matter decomposition performance) cannot be obtained.

[0008]

In order to solve the above-mentioned problems, the present invention is provided with a filter having a filter capable of removing a suspended substance of water in a flow path, and at least one pair of filters capable of producing electrolyzed water by electrolysis. And a circulating flow formed by convection generated by electrolysis between the filtering means and the electrolytic means.

According to the above invention, since the entire amount of water passing through the flow path passes through the filter in the filtering means, the efficiency of removing suspended substances in the water can be improved. further,
At the time of sterilization of water, the inflow of water from the outside to the filtration means and the electrolytic means is stopped, and electricity is supplied to the electrodes in the electrolytic means,
Electrolyzes water to produce electrolyzed water. By this operation,
Oxygen and hydrogen gas are generated between the electrodes in the electrolysis means, and accordingly, an upward water flow (convection) is generated between the electrodes. When convection of water occurs, a slow circulating flow is generated between the filtration means and the electrolysis means, so that the amount of electricity per unit volume of water increases as compared to a case where water passes directly between the electrodes, Electrolyzed water can be generated by effectively using chlorine ions in water, and sterilization performance can be improved. Further, since the circulating water discharges the generated electrolyzed water out of the space between the electrodes, the electrolyzed water is not decomposed by the side reaction of the electrodes, and can be efficiently sterilized.

[0010]

DETAILED DESCRIPTION OF THE INVENTION A water purifying apparatus according to a first aspect of the present invention includes a filtering means provided with a filter capable of removing suspended substances in a flow path of water, and at least an electrolytic water capable of producing electrolyzed water by electrolysis. An electrolytic means having a pair of electrodes, wherein a circulating flow can be formed between the filtering means and the electrolytic means by convection of water generated by electrolysis.

[0011] Then, while the suspended matter in the water can be removed efficiently, while the circulation of water is stopped, a circulating flow is generated by electrolysis between the filtration means and the electrolysis means, and the circulating flow is generated. By performing electrolysis, chlorine ions in water can be used efficiently, and the generation efficiency of electrolyzed water improves.
Purification and sterilization performance can be improved.

[0012] The water purifying apparatus according to claim 2 of the present invention comprises:
As the filter, a hollow filter is used, and an electrolytic means is provided in the hollow portion.

Since the electrolytic means is housed in the hollow portion of the filter, the electrolytic means and the filtering means are integrated, and the size of the apparatus can be reduced.

According to a third aspect of the present invention, there is provided a water purifying apparatus.
Electrolysis means is provided downstream of the filter.

[0015] By filtering the organic matter such as the suspended matter through the filter, the consumption of the electrolyzed water by the organic matter such as the suspended matter deposited on the filter can be reduced, and the sterilization performance can be improved.

[0016] The water purification apparatus according to claim 4 of the present invention comprises:
Electrolysis means is provided upstream of the filter. Microorganisms that propagate as nutrients such as suspended solids deposited on the filter can be sterilized by electrolyzed water such as hypochlorite generated by the electrolytic means, thereby preventing microbial contamination of bathtub water. At the same time, it is possible to suppress the production of a biofilm produced by propagation of microorganisms, so that an increase in pressure loss of the filter can be suppressed.

According to a fifth aspect of the present invention, there is provided a water purifying apparatus.
Electrolysis means are provided on both the upstream and downstream sides of the filter.

By using the electrolyzed water generated on the downstream side of the filter for sterilization of water and the electrolyzed water generated on the upstream side of the filter for sterilization of the filter, it is possible to maintain sterilization performance in water and maintenance of filtration performance. It can be carried out.

[0019] The water purifying apparatus according to claim 6 of the present invention comprises:
A bypass is provided for connecting a flow path on the downstream side of the filter in the filtration means and a flow path on the downstream side of the filtration means, and the bypass path is provided with electrolysis means.

The circulation flow can be effectively generated by the bubbles generated by the electrolysis between the electrolytic means and the filtering means via the bypass passage, so that the chlorine ions are effectively used and the electrolytic water is used. And the sterilization performance can be enhanced.

[0021] The water purifying apparatus according to claim 7 of the present invention comprises:
A chlorine ion supply means capable of supplying chlorine ions was provided.

Then, the chloride ion concentration in the water increases,
Since the generation efficiency of electrolyzed water is improved, high sterilization performance can be maintained regardless of the water quality.

[0023] The water purification apparatus according to claim 8 of the present invention comprises:
The chlorine ion supply means includes a salt water tank for storing salt and a saline solution, a salt water flow path capable of supplying a saline solution to at least one of a filtration means, an electrolysis means, and a bypass, and a flow downstream of the filtration means. It is provided with a water supply path connecting the road and the salt water tank, and a water supply pump provided in the water supply path to feed water into the salt water tank.

Then, the water on the downstream side of the filtering means is fed into the salt water tank by the water supply pump, so that water containing a small amount of suspended matter which causes clogging in the water can be used. The water (chlorine ion) supply is not stopped or reduced, the generation efficiency of the electrolyzed water is stabilized, and the sterilization performance can be maintained.

According to a ninth aspect of the present invention, there is provided a water purifying apparatus.
A filter is provided vertically.

Since the gas (oxygen and hydrogen gas) generated by the electrolysis can easily flow out of the electrolytic means outlet into the flow path, no air bubbles accumulate inside the filter, so that the water generated during the electrolysis is circulated. The flow can be maintained, the generation efficiency of the electrolyzed water can be stabilized, and the sterilization performance can be maintained.

[0027] A water purification apparatus according to a tenth aspect of the present invention has a space at a lower end portion of the electrode in the electrolytic means and a bottom surface in the electrolytic means.

Since the salt water supplied by the chlorine ion supply means is sucked upward from the lower end of the electrode, the salt water can be diffused to the electrolysis means and the filtration means, so that the generation efficiency of the electrolyzed water is improved and the sterilization performance is improved. Can be improved.

[0029] The water purification apparatus according to claim 11 of the present invention is provided with a gas-liquid separation means capable of separating gas and liquid in a flow path.

[0030] Then, the gas generated by the electrolysis is retained in the electrolysis means and the filtration means so that the circulation of water is not hindered, and the electrolyzed water can be generated stably, so that the sterilization performance is stabilized.

In the water purifying apparatus according to the twelfth aspect of the present invention, the gas-liquid separating means is disposed above the filtering means and the electrolytic means.

The gas generated by the electrolysis can be effectively sent to the gas-liquid separation means.

According to a thirteenth aspect of the present invention, in the water purifying apparatus, the filtering means has an outlet in an upward direction so that gas in the filtering means is discharged to the harm of the means. A connecting means is connected to the flow path as a separating means, and a bypass is connected to the outlet.

Since the gas generated by the electrolysis can be discharged to the flow channel, the flow channel can be used as gas-liquid separation means, and the apparatus can be simplified.

The water purifying apparatus according to claim 14 of the present invention is provided with a washing means for washing the filter.

Further, since organic substances such as suspended substances on the filter surface can be removed by the washing means, consumption of electrolytic water in the filter portion can be suppressed, and pressure loss in the filter portion can be kept constant. .

[0037] In the water purifying apparatus according to claim 15 of the present invention, the salt water flow path of the chlorine ion supply means is connected to the upper bypass path of the electrolytic means.

Since the high concentration of chlorine ions can be supplied between the electrodes of the electrolytic means, the generation efficiency of the electrolyzed water can be improved.

A water purifying apparatus according to a sixteenth aspect of the present invention is characterized in that the salt water flow path of the chlorine ion supply means is connected to a lower bypass path of the electrolytic means.

Since the whole amount of the salt water supplied from the chlorine ion supply means is diffused into the water by the bubbles generated by the electrolysis, the chlorine ion concentration in the water can be efficiently used.

A water purifying apparatus according to a seventeenth aspect of the present invention is configured such that the cross-sectional area of the lower bypass path of the electrolytic means is smaller than the cross-sectional area of the upper side of the electrolytic means.

The gas generated by the electrolysis is easily discharged from the electrolysis means and the bypass to the flow path, and the water generated by the electrolysis is easily circulated, so that the generation efficiency of the electrolyzed water can be improved. .

The water purifying apparatus according to the eighteenth aspect of the present invention is provided with an inlet of an electrolytic means through which water flows from a filtering means via a bypass, above the lower end of the electrode.

Since salt water can be retained near the lower end of the electrode inside the electrolysis means, chloride ions can be used effectively, and the generation efficiency of electrolyzed water is improved.

[0045] In the water purifying apparatus according to claim 19 of the present invention, the bypass connected to the filtering means is installed lower than the bottom of the filter.

Even when the salt water supplied by the chlorine ion supply means is fed from the electrolysis means in a state of insufficient diffusion, the salt water can be prevented from accumulating at the bottom of the filter, so that the salt water can be effectively used. it can.

[0047]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 shows a water purification apparatus according to Embodiment 1 of the present invention. In this example, the electrolyzed water generated by the electrolysis was described as hypochlorous acid. Therefore, substances that can be generated by electrolysis (chlorine compounds such as hypochlorous acid and hypochlorite ions, and active oxygen species such as ozone and hydrogen peroxide) are included.

In FIG. 1, the water in the bathtub 7 enters the circulation channel 10 from the adapter 9 of the bathtub 7 by the operation of the circulation pump 8 and reaches the purification unit 13 through the channel switching valves 11 and 12. I do. Thereafter, the water returns from the adapter 9 to the bath 7 through the circulation channel 10. A backwash flow path 14 is provided in the flow path switching valve 11, and a drainage path 15 is provided in the flow path switching valve 12, thereby enabling backwashing (hereinafter, backwashing).

As shown in FIG. 2, the purifying section 13 includes a filtration tank 16 of a filtering means, a bypass 18 and a bypass 1.
8, a salt water tank 19 having a salt solution having a concentration equal to or higher than the saturation concentration therein, a salt water pump 20, and a salt water channel 21 for feeding the salt water in the salt water tank 19 to the electrolytic tank 17.
And a tank water supply passage 22 for feeding water from the circulation flow passage 10 into the salt water tank 19 by the operation of the salt water pump 20. The filter tank 16 has a pleated nonwoven fabric filter 23 inside, and the electrolytic tank 17 has electrodes 24 and 25 capable of generating hypochlorous acid by electrolysis. These electrodes 24 and 25 are fixed to the electrolytic cell 17 by electrode terminals (not shown), and electricity is supplied from these terminals to the electrodes. Further, the filtration tank 16 and the electrolytic tank 17
In the upward direction, bubbles generated by the electrolysis are
And a separation tank 26 serving as a gas-liquid separation unit for separating water. Further, the circulation pump 8 and the flow path switching valves 11 and 1 in FIG.
2, energization of the electrodes 24 and 25 and the operation of the salt water pump 20 in FIG. In this embodiment, the electrodes 24.
No. 25 uses titanium as a base material and has a surface coated with a noble metal such as platinum and an iridium compound (such as iridium oxide).

In this embodiment, a non-woven fabric filter (pore size: 5 to 30 μm) is used as the filter 23. If the filter has a pore size in this range, a woven fabric filter, a ceramic filter, a porous filter, or the like is used. May be used.

Further, in this embodiment, the salt is put in the salt water tank 19 at a saturation concentration or higher to reduce the size, but the salt (NaCl) may be replaced with a chlorine compound and the electrolyte (potassium chloride, potassium chloride or the like). Salts, HCl, sodium hypochlorite, etc.).

Next, the operation and operation will be described. Bathtub 7
When removing suspended substances in water in the bath, the water in the bathtub 7 is
The operation of the circulating pump 8 enters the purifying section 13. The water that has reached the purification section 13 first enters through the filter tank inlet 16a, and the suspended substance is removed by the internal filter 23. The water that has passed through the filter 23 branches into the filter tank outlet 16b and the bypass passage 18, and is separated. At the outlet 26a of the tank 26, it enters the circulation channel 10 again, and returns to the bathtub 7.

First, when the chlorine ion concentration in water is high,
Alternatively, a case where hypochlorous acid is not so required for sterilization will be described.

At the time of sterilization, the operation of the circulation pump 8 is controlled by the control means 27, the inflow of water from the outside is stopped, the electrodes 24 and 25 in the electrolytic cell 17 are energized, and the water is electrolyzed. Generates chlorous acid. By this operation, the electrolytic cell 1
Oxygen and hydrogen gas are generated between the electrodes 24 and 25 in 7,
Since this floats upward, water flows upward in the electrolytic cell 17. By this flow, water on the downstream side of the filter 23 is sucked into the bypass passage 18 and the electrodes 24, 2
A circulating flow of water is generated between 5 and between the electrolytic cell 17 and the filtration tank 16. That is, the water slowly circulates between the electrodes and on the downstream side of the filter 23 and in the electrolytic cell 17. Since the electrolysis is performed in such a state, the amount of electricity per unit volume of water is increased as compared with a case where the water in the circulation channel 10 is forcibly passed directly between the electrodes 24 and 25, and the chlorine ion in the water is increased. Can be used effectively to generate hypochlorous acid and improve the sterilization performance.

Next, when the chlorine ion concentration in the atmosphere is low or when a large amount of hypochlorous acid is required for sterilization, the following procedure is performed. The circulation pump 8 is stopped by the control device 27, the salt water pump 20 is operated, and the water in the circulation channel 10 is fed into the salt water tank 19. When water is fed into the salt water tank 19, the saline solution is sent from the salt water channel 21 to the bypass 18 in the upward direction of the electrolytic cell 17. Then, the control device 2
At 7, the electrodes 24 and 25 are energized to start electrolysis. During the electrolysis, the polarity of the electrode is switched at predetermined time intervals (specifically, it is set according to the water quality between 1 minute and 15 minutes), and control is performed to prevent the scale from adhering to the electrode surface. . When electrolysis is performed, hydrogen and oxygen gas are generated at the same time as hypochlorous acid is generated. Most of these gases are generated on the surfaces facing the electrodes 24 and 25 and float upward between the electrodes 24 and 25, so that an upward flow of water is generated in the electrolytic cell 17. The filter 23 is a pleated non-woven fabric filter having a hollow structure, and is installed so that the outlet thereof is directed vertically upward and downward. Therefore, when an upward flow is generated in the electrolytic cell 17, water on the downstream side of the filter 23 (that is, water in a hollow portion) is immediately sucked into the bypass 18. Bypass 18
Since the diameter is smaller than the downstream side of the filter 23, the circulation of water between the filtration tank 16, the bypass 18, and the electrolytic tank 17 can be efficiently generated. By the generation of this circulating flow, the salt solution sent from the salt water channel 21 is diffused and homogenized, and at the same time, the added chlorine ions locally accumulate and are not effectively used. Efficiency can be improved.

Since the filter 23 is installed vertically and the entrance and exit of the hollow filter are set up and down, even if bubbles generated by electrolysis are mixed in the hollow portion, this filter is not used. Air bubbles can be discharged from the upward outlet without staying in the portion, and the filter 2
Bubbles do not accumulate in 3 and do not hinder the circulating flow, and at the same time, the water flow resistance is low.

When the concentration of chlorine ions supplied from the salt water channel 21 is high, hypochlorous acid is rapidly generated by electrolysis, while hypochlorous acid generated by electrolysis has a high concentration in the atmosphere. Is continued, an electrode side reaction occurs and is reduced to chloride ions by electrolysis. In this way, a circulating flow is generated, the concentration of chlorine ions is made uniform, and the electrolysis is performed, whereby the electrodes 24 and 25 are separated. Because the hypochlorite circulating flow generated in the above is discharged from between the electrodes and the uniformized chlorine ions are electrolyzed, the hypochlorous acid concentration does not become extremely high near the electrodes, and Improve chloric acid production efficiency. Hypochlorous acid generated by electrolysis is stored in the downstream side of the filter 23, in the electrolytic cell 17, and the bypass passage 18. However, since the generated hypochlorous acid hardly permeates to the upstream side of the filter 23, The amount of consumption by the organic matter trapped on the upstream side of the filter 23 is small (specifically, consumption of 1% or less after being left for 1 hour), and most of the hypochlorous acid generated here can be used for sterilization. Therefore, the sterilization performance can be improved.

Further, in this embodiment, the salt water pump 20 is operated to supply the saline solution from the salt water tank 19 to the electrolytic cell 17 to perform electrolysis to generate hypochlorous acid. Sea water containing a large amount of chlorine ions in the water, or when hypochlorite is not required to sterilize the water to be treated (when the organic matter content is low, for example, TOC is 2 mgC / L (ppm)
In the following cases), chlorine ion supply means is unnecessary,
In many tap waters, the chloride ion concentration in the water is 5
0 ppm or less, for example, when sterilizing bath water (TOC immediately after bathing is about 5 ppm or more), it is consumed by organic matter in the water, so that sufficient sterilizing ability may not be obtained, and chlorine ion supply may not be achieved. Means are required. Furthermore, since the conductivity in water increases by supplying chlorine ions with the chlorine ion supply means, it becomes possible to easily generate hypochlorous acid even in an area having low conductivity.

In this embodiment, the salt water passage 21 is connected to the bypass passage 18 in the upward direction of the electrolytic cell 17, that is, the filter 2.
3, a salt water channel 21 is installed in a circulation system formed by the electrolytic cell 17, the bypass path 18, and a separation tank 26 serving as a gas-liquid separation means to supply a saline solution. A circulating flow is generated by the decomposition, the saline solution is agitated, and the chloride ions are made uniform, and the production efficiency of hypochlorous acid is improved as described above. In particular, when hypochlorous acid is supplied from above the electrolysis tank 17, the saline solution becomes a water mass due to a difference in specific gravity and descends between the electrodes 24 and 25 from above. Between electrodes 2
Since a DC current is flowing through the control devices 27 to 4 and 25, hypochlorous acid is generated by electrolysis. At this time,
Since the chloride ion concentration in the water body of the saline solution is high, a high concentration of hypochlorous acid can be generated in a short time. The generated hypochlorous acid is quickly discharged out of the electrolytic cell 17 by the circulating flow, enters the downstream side of the filter 23 from the separation tank 26, and diffuses in the process of being fed into the electrolytic cell 17 again. Even if the electrolysis is carried out, the decrease in hypochlorous acid generation efficiency due to the electrode side reaction can be suppressed. Therefore, the efficiency of generating hypochlorous acid can be improved, and the sterilization performance can be improved.

Further, the bubbles generated by the electrolysis have the merit of causing a circulating flow, but on the other hand, if the electrolysis time is long, the downstream side of the filter 23, the electrolysis tank 1
7. The fluid accumulates in the bypass passage 18 and no circulating flow is formed, which lowers the efficiency of hypochlorous acid generation. Therefore, the separation tank 26 of the gas-liquid separation means is installed on the downstream side of the filtration tank 16 and the bypass 18, and the air bubbles and the water are separated at this portion so that the separated air bubbles are discharged to the circulation channel 10. Parts such as an electrolytic cell and a circulation channel 10 are arranged. As a result, water remains in the lower portion of the separation tank 26, so that water discharged from the electrolytic tank 17 is sucked into the filtration tank 16 from the filtration tank outlet 16b to maintain a circulating flow. And the production efficiency of hypochlorous acid can be maintained. Further, in the embodiment, since the separation tank 26 as the gas-liquid separation means is disposed above the filtration tank 16 and the electrolytic tank 17,
Most of the air bubbles generated in the filtration tank 16 are sent to the separation tank 26, and at the same time, air bubbles that cannot be sufficiently removed just by passing through the separation tank 26 and enter the filtration tank 16 are also separated by floating separation.
, So that efficient gas-liquid separation can be achieved.

The diameter of the pipe in the bypass passage 18 is changed above and below the electrolytic cell 17. That is, since the diameter of the bypass passage on the upper side of the electrolytic cell 17 is made larger than the diameter of the bypass passage on the lower side of the electrolytic cell 17, bubbles generated by the electrolysis are easily generated, and the circulating flow is efficiently generated. Can be done.

When the amount of the saline solution supplied from the salt water channel 21 is large, the saline solution may be sent to the filtration tank 16 without being sufficiently stirred. Assuming such a case, a taper portion 28 is provided so that water on the downstream side of the filter 23 is easily sucked into the bypass passage 18, and the bypass passage is configured to be lower than the filter bottom portion 23a.
Therefore, the salt solution accumulated in the bottom portion of the filtration tank 16 is easily sucked and sent to the electrolytic tank 17 again through the bypass passage 18, so that the efficiency of generating hypochlorous acid can be maintained. Further, when the saline solution accumulates in the filtration tank 16 as described above, even if the saline solution is fed into the bypass passage 18, the bypass passage 18 between the filtration tank 16 and the electrolytic tank 17 is not removed.
In some cases, the saline solution may accumulate, and the entire amount of the saline solution may not be used. Therefore, as shown in the electrolytic cell 17 of FIG. 2, the inlet 17a of the bypass passage 18 connecting the filtering means 16 and the electrolytic cell 17 on the electrolytic cell 17 side is disposed above the lower ends of the electrodes 24 and 25, thereby making the bypass. The saline solution in the channel 18 can be poured into the electrolytic cell 17. Since the lower ends of the electrodes 24 and 25 are separated from the bottom surface 17b of the electrolytic cell 17, the saline solution fed from the bypass passage 18 accumulates at the bottom of the electrolytic cell 17 and is generated along with the generation of electrolytic bubbles. The hypochlorite is wound up between the electrodes 24 and 25 by the circulating flow to generate hypochlorous acid, and at the same time, the saline solution is diffused, and the supplied saline solution can be used effectively to produce hypochlorous acid. And sterilization performance is improved.

When the distance between the electrodes 24 and 25 is large,
If the lower ends of the electrodes 24 and 25 are too far from the bottom surface 17b of the electrolytic cell 17, the circulating flow generated by the electrolytic decomposition is weakened, so that the distance between the bottom surfaces and the lower ends of the electrodes 24 and 25 is 3 mm or less. It is 2 mm or less. It is necessary to design the distance between the electrodes 24 and 25 and the distance between the bottom surface and the lower end of the electrode to be such that the supplied saline solution can be sucked.

When the suspended substances are removed by the filter 23 and left for a long time in this state, bacteria grow on the filter 23. In particular, in the case of water containing a large amount of protein such as bathtub water, bacteria decompose these and secrete amino acids, organic acids and the like into the water. The secreted amino acids and organic acids easily bind to hypochlorous acid, thereby wasting hypochlorite generated by electrolysis. Therefore, the flow path switching valves 11 and 12
, The circulation pump 8 is started, and a flow of water in a direction opposite to that during the filtration is given to the filter 23. As a result, most of the organic substances adhering to the surface of the filter 23 are peeled off and discharged out of the device from the drainage channel 15.
Organic matter on the surface is reduced. Therefore, the production amount of amino acids and organic acids due to the propagation of bacteria is reduced, so that the waste of hypochlorous acid can be suppressed and the sterilization performance can be improved. Hypochlorous acid is retained inside the filtration tank 16 and the electrolytic tank 17 by electrolysis, and then backwashed, whereby the filter 2 is removed.
Organic substances adhering to the surface of the filter 3 can be chemically peeled and removed, and the organic substances on the surface of the filter 23 can be further reduced, and the sterilizing effect can be improved. If it is difficult to remove organic matter from the surface of the filter 23, use a filter 2
The cleaning effect can be further improved by using a cleaning means (brush, ultrasonic wave, hot water, or the like) capable of physically cleaning 3.

(Embodiment 2) FIG. 3 shows a purifying section 13 according to Embodiment 2 of the present invention. The second embodiment is different from the first embodiment in that the salt water passage 21 is connected to a bypass passage 18 between the filtration means 16 and the electrolytic cell 17, that is, the salt water passage 21 is provided below the electrolytic cell 17. Is located. The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.

In the case where the circulation flow is slow (when the amount of added saline solution is large and the generation of oxygen and hydrogen bubbles is small, etc.), the method of supplying the saline solution as in the first embodiment is performed until the saline solution is uniformly diffused. However, by arranging the salt water passage 21 in the bypass passage 18 between the filtration tank 16 and the electrolytic tank 17 in this way, the entire amount of the supplied saline solution can be circulated by electrolysis immediately after the supply. As a result, it passes between the electrodes 24 and 25 and enters the filtration tank 16 from the electrolytic tank 17 while being stirred, so that the chloride ion concentration in the filtration tank 16, the electrolytic tank 17, and the bypass 18 can be quickly made uniform. Therefore, the production efficiency of hypochlorous acid is improved, and the sterilization performance is improved.

In this embodiment, the salt water passage 21 is provided in the bypass 18 connecting the electrolytic cell 17 and the filtration tank 16. However, even if the salt water path 21 is provided on the bottom surface 17b of the electrolytic cell 17, the efficiency of generating hypochlorous acid is reduced. Can be improved.

(Embodiment 3) FIG. 4 is a block diagram showing a purification unit 13 according to Embodiment 3 of the present invention. The third embodiment is different from the first and second embodiments in that electrodes 24 and 25 are provided in a hollow portion of a hollow pleated filter 30 in a filtration tank 29.
In addition, the salt water channel 21 is provided in the groove 29c between the electrodes so as to be able to supply the saline solution, and the separation tank 26 is eliminated. The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described. Water in the flow path enters the filtration tank 29 from the filtration tank inlet 29a, and the suspended matter is removed by the filter 30. Return.

When hypochlorous acid is generated, the control means 27 starts the salt water pump 20 a predetermined number of times to store the salt water in the groove 29c. After that, when electricity is supplied to the electrodes 24 and 25, the electrode is electrolyzed to a downstream side (inside) of the filter 30.
In this case, convection of water is generated inside due to bubbles generated between the electrodes 24 and 25. Since the bubbles rise upward in the electrodes 24 and 25, the salt solution in the groove 29c is rolled up. At the same time, the electrode 2
Since water flows from the back surfaces of the electrodes 4 and 25 (opposite the opposing surface) through the groove 29 and enters between the electrodes 24 and 25, two flows are generated around the electrodes 24 and 25, respectively. Therefore, the chlorine ions become uniform, and the same hypochlorous acid generation efficiency as in Example 1 can be obtained.
Furthermore, since the filtration tank outlet 29b is provided above the electrodes 24 and 25, the generated air bubbles are efficiently discharged to the circulation channel 10, and the compactness can be achieved without the need for the gas-liquid separation means. .

(Embodiment 4) FIGS. 5 and 6 are configuration diagrams showing a purification unit 13 according to Embodiment 4 of the present invention. The difference between the fourth embodiment and the first, second, and third embodiments is that, in FIG. 5, the electrodes 24 and 25 are provided as electrolysis means on the upstream side of the filter 32 in the filtration tank 31 and on the lower side of the electrodes 24 and 25 in FIG. A groove 31c is provided so that a salt solution can be supplied between the electrodes 24 and 25.
In FIG. 6, a bypass passage 18 is provided between the upstream side of the filter 35 of the filtration tank 33 and the electrolytic tank 34, and a separation tank 36 serving as a gas-liquid separation means is provided above these. Where you are. The components having the same reference numerals as those in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation of the embodiment shown in FIG. 5 will be described. Water in the flow path 10 enters the filtration tank 31 from the filtration tank inlet 31a, and the suspended matter (in the case of a bath, most of organic matter ) Is removed. Bacteria grow on the surface of the filter 32 using these as nutrient sources. When bacteria grow on the filter 32, the filter 32 is formed by extracellular substances (biofilm) generated by the growth of bacteria.
Pressure loss (hereinafter, referred to as pressure loss) increases, and an abnormal smell is generated from the filter 32, and the bather may feel disgust.

Therefore, in the present embodiment, the salt solution is fed from the salt water channel 21 into the filtration tank 31 and stored in the groove 31c, and thereafter, electricity is supplied to the electrodes 24 and 25 to perform electrolysis to generate hypochlorous acid. I have. The saline solution in the groove 31c is sucked up by the flow of water between the electrodes generated by the electrolysis, and the chlorine ion concentration in the water becomes uniform, so that the same hypochlorous acid generating ability as in Example 1 is obtained. Can be. The hypochlorous acid generated here is allowed to stand for a certain period of time and is brought into contact with the filter, thereby suppressing the growth of bacteria on the surface of the filter 32. Therefore, it is possible to suppress the generation of biofilm and the generation of off-odors. That is, the performance of removing suspended substances can be maintained, and at the same time, the generation of off-flavors can be suppressed. After the filter 32 is sterilized, the circulation pump 8 is started, and the water containing hypochlorous acid in the purification unit 13 is sent into the bathtub 7, so that the sterilization in the bathtub 7 becomes possible and a comfortable bathing can be realized.

When it is desired to use the salt solution supplied from the salt water passage 21 more effectively, as shown in FIG. 6, a bypass passage 18 connecting the upstream side of the filtration tank 33 and the electrolytic tank 34 is connected.
The saline solution is fed from the saline channel 21 to the inlet 3 of the electrolytic cell.
By stagnating from 4a on the bottom surface 34b of the electrolytic cell 34 and performing electrolysis, a circulating flow is formed in the same manner as in Example 1, and effective generation of hypochlorous acid becomes possible. At the same time,
Since the suspended matter is removed from the water entering from the separation tank inlet 36a by the filter 35, the water can have the same turbidity as that of the first embodiment.

(Embodiment 5) FIG. 7 is a block diagram showing a purification unit 13 according to Embodiment 5 of the present invention. The fifth embodiment is different from the first embodiment in that electrodes 42 and 43 are provided on the upstream side of the filter 23 in the filtration tank 37, and a salt water passage 40 is connected to the groove 37 c so that saline can be supplied. The flow path switching valve 41 is provided on the top 21. The materials of the electrodes 42 and 43 are the same as those of the electrodes 24 and 25 of the first embodiment.

The components having the same reference numerals as in the first embodiment have the same structure, and a description thereof will be omitted.

Next, the operation and operation will be described. When removing suspended substances in the water, suspended water is removed from the water in the circulation channel 10 through the filter tank inlet 37a by the filter 23 in the same manner as in Example 1, and the water is removed from the filter tank outlet 37b. 39
And is discharged to the circulation channel 10 from the separation tank outlet 39a.

Next, when sterilizing the inside of the bathtub 7, the circulation pump 8 is stopped by the control means 27 and the salt water pump 20 is started. As a result, a predetermined amount of the saline solution in the salt water tank 19 enters through the salt water passage 21 from above the electrolytic cell 38.
Thereafter, the electrodes 24 and 25 are energized to start electrolysis, and the downstream side of the filter 23, the electrolytic cell 38, and the bypass 18 are filled with hypochlorous acid. After the generation of hypochlorous acid is completed, the circulation pump 8 is started again by the control means 27, and hypochlorous acid is fed into the bathtub 7 to sterilize the water in the bathtub 7.

If left as it is, the concentration of hypochlorous acid in the bath tub 7 will decrease, and bacteria will be propagated by the suspended matter (organic matter) filtered by the filter 23, thereby producing a biofilm or an unpleasant odor. Cannot be maintained.

Therefore, in this embodiment, the operation is performed once or more every two days, preferably once or twice a day,
The surface of No. 3 is sterilized. That is, the control means 27 stops the circulation pump 8 at a predetermined timing (preferably outside of the bathing time), switches the salt water passage switching valve 41, starts the salt water pump 20, and switches the salt water in the salt water tank 19 into the salt water passage. From 40, it supplies to the groove 37c in the filtration tank 37. afterwards,
The electrodes 42 and 43 are energized, and the grooves 37c are formed by electrolysis.
To produce hypochlorous acid. After the generation, the circulation pump 8 is stopped for a predetermined time, and hypochlorous acid is retained on the upstream side of the filter 23 for a predetermined time. Then, the circulation pump 8 is started again by switching the flow path switching valves 11 and 12, and the water in the filtration tank 37 is discharged from the backwash flow path 14 to the outside of the water purification device. Since bacteria existing on the surface of the filter 23 are sterilized in this manner, formation of a biofilm, generation of amino acids and organic acids generated by decomposition of organic substances of bacteria, and generation of off-odor can be suppressed. Therefore, waste of the hypochlorous acid generated downstream of the filter 23 is eliminated, so that the water in the bathtub 7 can be effectively sterilized.

(Embodiment 6) FIG. 8 is a configuration diagram of a purification unit 13 according to Embodiment 6 of the present invention. In the sixth embodiment, the difference from the first embodiment is that the outlet from the filtering means 16 to the circulation channel 10 is installed facing upward, and the outlet 16 b of the filtration tank is higher than the connection with the bypass 18. Thus, there is no gas-liquid separation means.

The components having the same reference numerals as in the first embodiment have the same structure, and the description is omitted.

Next, the operation and operation will be described. When the suspended matter of water in the bathtub 7 is removed and hypochlorous acid is generated by electrolysis, each part functions in the same manner as in Example 1.
Since the bubbles generated by the electrolysis flow from the bypass passage 18 to the circulation flow passage 10 through the filtration tank outlet 16b, the bubbles in the filtration tank 16 and the electrolytic tank 17 are removed, and the first embodiment is performed.
Filter tank 16, electrolytic tank 17, bypass 18
Since a circulating flow can be formed at the same time, it is possible to obtain the same hypochlorous acid generating ability as in Example 1. Therefore, the configuration of the purification unit 13 can be simplified while maintaining the sterilizing performance.

In Examples 1 to 6, the electrodes 24,
Electrolyzing means having no diaphragm between 25, 42, and 43 was used, but by providing a diaphragm between these electrodes, strong oxidizing water with high oxidizing power and strong alkaline water with high reducing power were generated. It becomes possible.

Further, a flow path for separating these is provided,
Use not only for disinfection in the bathtub, but also for disinfection and cleaning of the filter section, so that not only the removal and disinfection performance of suspended substances, but also the decomposition of organic matter in water is possible, and the purification and disinfection performance can be improved. .

Then, in Examples 1 to 6, the electrode (2
4, 25 and 42, 43) have electrode terminals, and the electrodes are used to fix the electrodes to the device and to conduct electricity from the control device 27. Further, in Examples 1, 2, 5, and 6, the electrode terminals are provided at the upper ends of the electrodes 24 and 25,
By providing a gap between the electrodes 24 and 25 and the inner surface of the electrolytic cell 16, air accumulated on the back surface of the electrode can be removed.

[0088]

As described above, in the water purifying apparatus according to the first aspect of the present invention, the suspended matter in the water can be efficiently removed by passing the entire amount of the water flowing into the flow path through the filtering means. At the same time, a circulating flow is generated by convection between the filtration means and the electrolysis means, and the electrolysis is performed while circulating, so that chlorine ions in the water can be efficiently used, the generation efficiency of the electrolyzed water is improved, and purification and Sterilization performance can be improved.

In the water purifying apparatus according to the second aspect, the electrolytic means can be housed in the hollow portion of the filter, so that the apparatus can be made compact.

In the water purifying apparatus according to the third aspect of the present invention, since the organic matter such as the suspended matter deposited on the filter is little consumed by the electrolyzed water, the organic matter such as the suspended matter is filtered by the filter. A certain amount of hypochlorous acid can be supplied, and stable sterilization performance can be maintained.

In the water purifying apparatus according to the fourth aspect, the microorganisms that propagate as nutrients by the organic matter deposited on the filter can be sterilized by the electrolyzed water such as hypochlorite generated by the electrolytic means. At the same time, it is possible to prevent microbial contamination of water, and at the same time, it is possible to suppress the formation of biofilms, which are produced by the propagation of microorganisms. Material removal performance can be maintained.

In the water purifying apparatus according to the fifth aspect, the electrolyzed water generated on the downstream side of the filter is used for sterilizing water, and the electrolyzed water generated on the upstream side of the filter is used for sterilizing the filter and preventing an increase in pressure loss. Therefore, it is possible to maintain the sterilizing performance and the suspended solid removing performance.

In the water purifying apparatus according to the sixth aspect, a circulating flow can be efficiently generated between the electrolytic means and the filtering means, so that the hypochlorous acid generation efficiency is improved and the disinfection effect is enhanced. be able to.

In the water purifying apparatus according to the seventh aspect, since the concentration of chloride ions between the electrodes is increased and the generation efficiency of the electrolyzed water is improved, high sterilization performance can be maintained regardless of the water quality.

[0095] In the water purifying apparatus according to the eighth aspect of the present invention, the water on the downstream side of the filtering means is fed into the salt water tank by a water supply pump, so that the water contained in the water does not contain suspended substances causing clogging. It is possible to stabilize the sterilization performance without suspending or reducing the supply of the saline solution (chloride ion) in the water supply pump due to the clogging of the suspended substance.

Further, in the water purifying apparatus according to the ninth aspect, the gas (oxygen and hydrogen gas) generated by the electrolysis can easily flow out of the electrolytic means outlet into the flow path, so that the convection of water is maintained. And a stable electrolytic water generation ability can be obtained. Therefore, sterilization performance can be maintained.

Further, in the water purifying apparatus according to the tenth aspect, since the salt water supplied by the chlorine ion supplying means is sucked upward from the lower end of the electrode, the salt water is diffused to the electrolytic means and the electrolytic means and the filtering means. And the generation efficiency of electrolyzed water is improved, so that the sterilization performance can be improved.

In the water purifying apparatus according to the eleventh aspect, a circulating flow is maintained in order to prevent bubbles generated by the electrolysis from staying in the electrolytic means and the filtering means, so that a stable hypochlorous acid producing ability is obtained. As a result, the sterilization performance is stabilized.

In the water purifying apparatus according to the twelfth aspect, since the gas generated by the electrolysis can be sent to the gas-liquid separation means, a stable hypochlorous acid generating ability can be obtained, and the sterilizing performance can be improved. Stabilize.

In the water purifying apparatus according to the thirteenth aspect, the gas generated by the electrolysis can be discharged to the flow path without using the gas-liquid separating means, so that the apparatus can be simplified.

The water purifying apparatus according to the fourteenth aspect suppresses the consumption of the electrolyzed water generated by the electrolytic means by organic substances such as suspended substances on the filter, and at the same time, ensures a stable purification performance. Can be maintained.

Further, in the water purifying apparatus according to the fifteenth aspect, it is possible to supply high-concentration chlorine ions between the electrodes of the electrolytic means, so that the generation efficiency of the electrolyzed water is improved, so that the sterilization performance can be improved. it can. Further, in the water purifying apparatus according to the sixteenth aspect, since the entire amount of the salt water supplied from the chlorine ion supply means is diffused into the water by bubbles generated by the electrolysis, the chlorine ion concentration can be efficiently used, and Since the production efficiency of chloric acid is improved, the sterilization performance can be improved.

Further, in the water purifying apparatus according to the seventeenth aspect, the gas generated by the electrolysis is easily discharged from the electrolytic means and the bypass to the flow path, and the convection of the water generated by the electrolysis is likely to occur. The production efficiency of hypochlorous acid is improved, and the bactericidal effect is improved.

Further, in the water purifying apparatus according to the eighteenth aspect, the salt water can be retained near the lower end of the electrode inside the electrolysis means, so that the supplied chlorine ions can be used effectively, and the generation efficiency of hypochlorous acid is reduced. As a result, high sterilization performance can be obtained.

In the water purifying apparatus according to the nineteenth aspect, even when the salt water supplied by the chlorine ion supplying means is fed from the electrolytic means in an insufficiently diffused state, it does not accumulate at the bottom of the filter. The production amount of chlorous acid is stabilized, and sterilization performance can be maintained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a water purification device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a purification unit of the water purification device.

FIG. 3 is a configuration diagram of a purification unit according to a second embodiment of the present invention.

FIG. 4 is a configuration diagram of a purification unit according to a third embodiment of the present invention.

FIG. 5 is a configuration diagram of a purification unit according to a fourth embodiment of the present invention.

FIG. 6 is a configuration diagram illustrating another example of the purification unit according to the fourth embodiment of the present invention.

FIG. 7 is a configuration diagram of a purification unit according to a fifth embodiment of the present invention.

FIG. 8 is a configuration diagram of a purification unit according to a sixth embodiment of the present invention.

FIG. 9 is a configuration diagram of a purification unit of a conventional water purification device.

[Explanation of symbols]

 Reference Signs List 8 circulation pump 10 circulation flow path 11, 12 flow path switching valve 13 purification section 14 backwashing path 15 drainage path 16, 29, 31, 33, 37 filtration tank 16b filtration tank outlet 17 electrolytic tank 17a inlet section 17b bottom face 18 bypass path Reference Signs List 19 salt water tank 20 salt water pump 21 salt water passage 22 water supply passage 23, 32, 30, 35 filter 23a filter bottom surface 24, 25, 42, 43 electrode 26, 36, 39 separation tank 27 control means 33, 40 salt water passage

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) B01D 29/00 B01D 29/00 E 29/11 C02F 1/50 510C 29/66 520L 29/64 520P 35/027 531P C02F 1/50 510 531Q 520 531R 540B 531 550D 550H 550L 540 560F 550 560Z B01D 29/10 510E 510G 560 520B 520C 530A 29/38 510C 520C 520A 520Z 550A 35/02 1006 Matsushita Electric Industrial Co., Ltd. F term (reference) 4D061 DA07 DA08 DB01 DB10 DB19 DC06 EB05 EB39 ED13 FA13 GC20 4D064 AA11 BF32 BF36 BF39 BF40

Claims (19)

[Claims] 1. A filter comprising: a filter provided with a filter capable of removing suspended substances in a flow path of water; and an electrolytic means provided with at least a pair of electrodes capable of producing electrolyzed water by electrolysis.
A water purification device which is capable of forming a circulating flow between the filtration means and the electrolysis means by convection of water generated by electrolysis. 2. A filtering means comprising a hollow filter capable of removing suspended substances in a water flow path, and at least one pair of electrodes capable of producing electrolyzed water by electrolysis in a hollow portion of the hollow filter. Water purification device provided with an electrolytic means. 3. The water purifier according to claim 1, wherein an electrolytic means is provided downstream of the filter. 4. The water purification apparatus according to claim 1, wherein an electrolytic means is provided upstream of the filter. 5. The water purifier according to claim 1, wherein electrolysis means is provided on both the upstream and downstream sides of the filter. 6. The water purifying apparatus according to claim 1, wherein a bypass is provided between the downstream side of the filter in the filtering unit and the downstream side of the filtering unit, and an electrolytic unit is provided in the bypass. . 7. The water purification apparatus according to claim 1, further comprising a chlorine ion supply means capable of supplying chlorine ions. 8. A chlorine ion supply means comprising: a salt water tank for storing salt and a salt solution; and a salt water tank connected to at least one of a filtration means, an electrolytic means, and a bypass, and a salt water tank. The water purifier according to claim 7, further comprising a water flow path, a water supply path connecting the flow path on the downstream side of the filtering means and the salt water tank, and a water supply pump provided in the water supply path and for feeding water into the salt water tank. 9. The water purifier according to claim 1, wherein the filter is provided in a vertical direction. 10. An electrode is arranged so as to have a space between a bottom surface inside an electrolytic means and a lower end portion of the electrode.
The water purification device according to any one of the above. 11. The water purification apparatus according to claim 1, wherein a gas-liquid separation means capable of separating gas and liquid is provided in the flow path. 12. The water purifying apparatus according to claim 11, wherein the gas-liquid separating means is disposed above the filtering means and the electrolytic means so that gas in the filtering means and the electric field means can be sent to the gas-liquid separating means. 13. The filtering means has an outlet upward so that gas in the filtering means is discharged out of the means, and connects the outlet to a flow path as gas-liquid separating means. The water purifier according to claim 6, wherein a bypass is connected to the outlet. 14. The water purifying apparatus according to claim 1, further comprising a washing means for washing the filter. 15. The water purifier according to claim 8, wherein the salt water flow path is connected to a bypass path above the electrolytic means. 16. The water purifier according to claim 8, wherein the salt water flow path is connected to a bypass on a lower side of the electrolytic means. 17. The water purification apparatus according to claim 6, wherein a cross-sectional area of a bypass passage above the electrolytic means is larger than a cross-sectional area of a bypass passage below the electrolytic means. 18. The water purifier according to claim 1, wherein an inlet of the electrolysis means is provided above a lower end of the electrode. 19. The water purifying apparatus according to claim 6, wherein a bypass connected to the filtering means is provided lower than a bottom of the filter.